I have no experience using Hornby points, but found this on the Hornby Web site:
Link to full page on Hornby site
One clip is shown in position on the photo, below and just before the frog.
It appears that a second clip should be inserted in the corresponding position above this.
An alternative would be to carefully solder wire links to the rails, but it looks easier to use the clips.
Referring to the photo, DCC power should be supplied as close as possible to the left hand side of the point, and also at regular intervals around your track. This will ensure you get a good DCC power connection to your layout.
Hope this works.